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0_0_16947250_29348.cpp
0_0_16947250_29348.cpp(15) : error C2668: “log”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1209): 可能是“long double log(long double) throw()”
        VC2013\INCLUDE\math.h(1093): 或       “float log(float) throw()”
        VC2013\INCLUDE\math.h(501): 或       “double log(double)”
        尝试匹配参数列表“(int)”时